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2+3n+n=5n+15
We move all terms to the left:
2+3n+n-(5n+15)=0
We add all the numbers together, and all the variables
4n-(5n+15)+2=0
We get rid of parentheses
4n-5n-15+2=0
We add all the numbers together, and all the variables
-1n-13=0
We move all terms containing n to the left, all other terms to the right
-n=13
n=13/-1
n=-13
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